Where is Polysphere?
Round Cube

I don't know if the codes comes from the "original" polysphere script, but with Extra Object add-on comes an operator called "Round Cube" which create a very similar geometry.



You'll just have to make sure to use the "Quadsphere" preset:





You can get the "original" polysphere script for pre-2.61 Blender version from the author website and then append the object in your scene (if you want to use a more recent version).

It seems to be slightly difference between the loopcuts position of the object created with the two methods.